<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body >
    <button id="btn" @click="handler($event,222)"></button>

    <div id="test">
        <input type="text" name="" @keydown.native.prevent="fn">
        <!-- <h3>{{val}}</h3> -->
    </div>
    
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <script>
        new Vue({
            el : "#test",
            data : {
                document : Document, 
            },
            methods : {
                handler(e,a,b){
                    console.log(e);
                    console.log(document);
                },
                fn(){
                    console.log(123);
                }
            }
        });
      

    </script>
</body>
</html>